There is a link between vitamin D insufficiency and adverse health outcomes such as gestational diabetes and preeclampsia in mothers-to-be and low birth weight in newborns, suggests a paper published on bmj.com today. Vitamin D insufficiency has been associated with a number of adverse health outcomes and has been recognised as a public health concern. Plus, observational data has suggested a link between low vitamin D and increased risk of adverse pregnancy outcomes (such as gestational diabetes, preeclampsia, risk of infections, caesarean section and foetal growth restriction). Knowledge of these associations is however limited.